The placement of the FirebaseAuth.onAuthStateChanged call in an Angular application is a common concern for developers

Question

The placement of the FirebaseAuth.onAuthStateChanged call in an Angular application is a common concern for developers

Where is the best place to add a global listener initialization call in an Angular app?

Take a look at this code snippet:

export class AuthService {
  constructor(
    private store: Store<fromAuth.State>,
    private afAuth: AngularFireAuth
  ) {
    this.afAuth.auth.onAuthStateChanged(payload => {
      if (payload) {
        const user: UserBeta = {
          uid: payload.uid,
          displayName: payload.displayName,
          email: payload.email,
          emailVerified: payload.emailVerified
        };

        this.store.dispatch(AuthActions.authenticated({ user }));
      } else {
        this.store.dispatch(AuthActions.notAuthenticated());
      }
    });
  }

I have added it to the constructor of the AuthService, but I'm not sure if that's the right approach.

One concern I have is that this code has dependencies on both Ngrx and AngularFireAuth.

In this scenario, would it be better to move this logic to the FirebaseModule (i.e. firebase.module.ts)? If so, how should the call be structured in the new location?

javascript angular typescript firebase firebase-authentication

Answer 1

Answer №1

To incorporate it, simply place the code snippet within the ngOnInit() method as specified in the official documentation:

The ngOnInit() is a callback function that runs immediately after the default change detector has finished checking the directive's bound properties for the first time, but before examining any view or content children. This function is only called once during the instantiation of the directive.

For further details, visit this link:

https://angular.io/api/core/OnInit

Answer 2

To incorporate it, simply place the code snippet within the ngOnInit() method as specified in the official documentation:

The ngOnInit() is a callback function that runs immediately after the default change detector has finished checking the directive's bound properties for the first time, but before examining any view or content children. This function is only called once during the instantiation of the directive.

For further details, visit this link:

https://angular.io/api/core/OnInit

Answer 3

Answer №2

I appreciate all of your responses.

After careful consideration, I have made the decision to implement a new method called initialize() within the AuthService and invoke it in the ngOnInit() method of the AppComponent.

auth.service.ts:

@Injectable({ providedIn: 'root' })
export class AuthService {
  constructor(
    private http: HttpClient,
    private store: Store<fromAuth.State>,
    private afAuth: AngularFireAuth
  ) { }

  initialize() {
    this.afAuth.auth.onAuthStateChanged(payload => {
      if (payload) {
        const user: UserBeta = {
          uid: payload.uid,
          displayName: payload.displayName,
          email: payload.email,
          emailVerified: payload.emailVerified
        };

        this.store.dispatch(AuthActions.authenticated({ user }));
      } else {
        this.store.dispatch(AuthActions.notAuthenticated());
      }
    });
  }
}

app.component.ts:

export class AppComponent implements OnInit {
  constructor(private authService: AuthService) { }

  ngOnInit(): void {
    this.authService.initialize();
  }
}

Update: In my project, I am utilizing ngrx for state management. Given that AngularFireAuth also handles user information, maintaining the same state in multiple locations posed challenges, leading to increased complexity. As a result, the final solution became quite intricate. Ultimately, I opted to discontinue the use of the onAuthStateChanged listener and instead persist the ngrx state locally.

Answer 4

I appreciate all of your responses.

After careful consideration, I have made the decision to implement a new method called initialize() within the AuthService and invoke it in the ngOnInit() method of the AppComponent.

auth.service.ts:

@Injectable({ providedIn: 'root' })
export class AuthService {
  constructor(
    private http: HttpClient,
    private store: Store<fromAuth.State>,
    private afAuth: AngularFireAuth
  ) { }

  initialize() {
    this.afAuth.auth.onAuthStateChanged(payload => {
      if (payload) {
        const user: UserBeta = {
          uid: payload.uid,
          displayName: payload.displayName,
          email: payload.email,
          emailVerified: payload.emailVerified
        };

        this.store.dispatch(AuthActions.authenticated({ user }));
      } else {
        this.store.dispatch(AuthActions.notAuthenticated());
      }
    });
  }
}

app.component.ts:

export class AppComponent implements OnInit {
  constructor(private authService: AuthService) { }

  ngOnInit(): void {
    this.authService.initialize();
  }
}

Update: In my project, I am utilizing ngrx for state management. Given that AngularFireAuth also handles user information, maintaining the same state in multiple locations posed challenges, leading to increased complexity. As a result, the final solution became quite intricate. Ultimately, I opted to discontinue the use of the onAuthStateChanged listener and instead persist the ngrx state locally.

The placement of the FirebaseAuth.onAuthStateChanged call in an Angular application is a common concern for developers

Answer №1

Answer №2

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